Author: Rabbitt, Mary C.; Edwin D. McKee; Charles B. Hunt; Luna B. Leopold,
Title: Colorado River Region and John Wesley Powell; Stratified Rocks of the Grand Canyon, Geologic History of the Colorado River;.
Description: Washington, U.S. Govt Ptg Office, 1969. G. The Rapids and the Pools - Grand Canyon. Geological Survey Professional Paper 669. Edge wear, owner stamps.

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